Orlando Nightclub Shooter Omar Mateen

A man who worked with Omar Mateen at an international security company said he made repeated formal complaints about his colleague’s aggressive behavior and alleged family connections to al Qaeda, but eventually quit his job when G4S refused to fire Mateen.

Daniel Gilroy, a former Fort Pierce police officer, told Florida Today he had raised concerns with his G4S supervisors after Mateen talked about killing people. Gilroy said his complaints were ignored by his superiors because Mateen was Muslim.

“I quit because everything he said was toxic and the company wouldn’t do anything. This guy was unhinged and unstable. He talked of killing people,” said Gilroy, who worked with Mateen at a gated community in South Florida where the company oversaw security operations.

Gilroy, a trained law enforcement officer, said Mateen also made homophobic and sexist comments that were “inflammatory and contradictory.” The Orlando killer also claimed, according to Gilroy, that he had family connections to al Qaeda.